Absorbtion

Question 1

1. active transport

Answer 1

Sodium ions are actively transports out of the epithelial cells of the ileum and into the blood stream.

This causes the concentration of the sodium ions to decrease

Question 2

2. Concentration gradient

Answer 2

The sodium ions in the ileum diffuse down their concentration gradient into the epithelial cells.

The sodium ions diffuse through a co transporter protein

Question 3

3. Co transporter

Answer 3

When sodium ions bind to a co transporter protein, amino acids or monosaccharides also bind to the protein.

Question 4

4. Conformational change

Answer 4

Binding of amino acids or monosaccharides causes a conformational change in the protein.

The conformational change transports the amino acids or monosaccharides into the epithelial cells.

Question 5

5. Epithelial cells

Answer 5

inside the epithelial cells, the amino acids or monosaccharides are used in reactions or absorbed into the blood stream.